<!-- 该文件类型是svg在html中的结构实例 -->

<?xml version="1.0"?>
<!DOCTYPE html>
<html>
<head></head>
<body>
<div style='width:400px; height: 400px'>
  <svg xmlns="http://www.w3.org/2000/svg" width='100%' height='100%'>
    <polyline points='50 50 200 300 230 300 250 200' fill='none' stroke='black' stroke-width='5'>
  </svg>
</div>
</body>
</html>